If memory serves me (and it usually doesn't), this is not a recent development. OK, I looked. No evidence I could see pre-dome. During the dome era it wasn't necessary at home, but I found a few examples of a break on day 2 of a series for another team's home opener (not opening day)- '92 @Mil, '96, 97, & 99 @Det. (I checked '74-82, 87-99)